4results about How to "Wide pH range" patented technology

A multi-barrier coupled treatment process for organic complexed heavy metals in wastewater from battery cathode material production is disclosed, relating to the field of wastewater treatment. The method involves: 1. Adjusting the pH of the wastewater to 3.0-4.5; 2. Adding iron salt and peracetic acid to an oxidation reaction tank; 3. Achieving primary removal of heavy metals through neutralization and precipitation after oxidation; 4. Adjusting the pH of the wastewater back to 6.0-6.5; 5. Passing the wastewater sequentially through a primary adsorption unit and a secondary adsorption unit. This invention utilizes the low bond energy characteristics of PAA and the synergistic oxidation advantages of multiple free radicals to solve the bottleneck problems of incomplete complex breaking, large sludge production, and narrow pH application range in traditional methods. After treatment by this invention, the total nickel concentration in the effluent is less than 0.05 mg / L, and the total cobalt concentration is less than 0.02 mg / L, consistently exceeding the limits of the "Emission Standard of Pollutants for Battery Industry" (GB 30484-2013), demonstrating broad industrial application prospects.

This utility model discloses a microwave-coupled Fenton catalytic oxidation system for treating recalcitrant organic wastewater, belonging to the field of wastewater treatment technology. It includes a reactor tank with an inlet pipe at the bottom and an outlet pipe at the top on one side. A circulation pipe is located on the other side, connected to a hydrogen peroxide storage tank via a hydrogen peroxide pipe. A ferrous pipe is installed above the inlet pipe, connected to a ferrous storage tank. A microwave generator is mounted on the top of the reactor tank, connected to a microwave transmitting antenna, which is protected by a PP sleeve. A pH meter and a temperature sensor are installed on both sides of the microwave generator and on the top of the reactor tank. The treated wastewater is mixed with hydrogen peroxide and introduced into the reactor tank through the circulation pipe, preventing the hydrogen peroxide from being prematurely consumed by mixing with highly concentrated wastewater. The temperature sensor reading is compared with a set temperature, and a PLC controller controls the microwave generator to reduce or stop irradiation, preventing excessively high temperatures from accelerating the Fenton side reaction.

The application relates to the technical field of wastewater treatment, and discloses a method for rapidly degrading phenol by using iron in phenol-containing wastewater, wherein safe and nontoxic cysteine is selected as a reaction initiator, and meanwhile, reduction and complexation are realized, so that the reaction is rapidly started, and the pH range of a traditional Fenton reaction is widened; Cu 2+ is selected as a reaction intensifier, Fe 3+ / Fe 2+ circulation is accelerated, phenol is rapidly degraded, and the degradation of other organic pollutants is synergistically improved; without preparing and adding complex and high-cost iron-containing activators, a small amount of iron contained in the wastewater is used as a Fe 2+ source, and recycling is formed in the system, so that the pollutant removal speed is greatly improved, and the generation of iron sludge is reduced. The technology has the advantages of being green, efficient, simple to operate and low in cost.

The application provides a paint residue derived activated carbon coated cobalt nanomaterial and a preparation method and application thereof, the preparation method in the application uses solid hazardous waste paint residue as raw material, and adsorbs metal cobalt ions on the paint residue; the cobalt ion-paint residue compound is calcined and pyrolyzed, a magnetic Co-AC catalyst is obtained, and the catalyst is applied to catalytic activation of peroxymonosulfate to degrade new organic pollutants in water. The paint residue derived activated carbon coated cobalt nanomaterial in the application can be used as a green and efficient heterogeneous Fenton-like catalyst, peroxymonosulfate is activated through a non-free radical pathway, and the catalyst is easy to separate and reuse under an external magnetic field.